[SOLVED] Writing a really basic 3D "engine"

[zoiddani]

Hi,
I need some advice from you. I am writing an application that draws 2D formulas. I am done with this part yet, and I thought that I could implement 3D formulas as well. I have my code, which makes from an x and y value a z value (with a formula), but I don't have a good way to make it show the picture.
Until now I've been using a simple code to draw the vertices like this: http://danielzolnai.files.wordpress.com/2011/04/3d.png
It was not hard to make this, at first I drew the vertices in the black shape, an then I just edited their y position depending on their z's.
But many times, the picture is not clear, so I need a basic 3D "engine" that can rotate. I dont need polygons, it's enough to draw the vertices and the edges connecting them. I don't need any pre-made engine, I'd like to write my own. Do you have any tutorials, or advices how to start?
Thank you, zoiddani

[Ñuño_Martínez]

What you are lookin for is basic 3D math.  Not Pascal code, but this article introduces you the basic 3D matrix math and stuff.

[zoiddani]

Thank you, that was exactly, what I was looking for!